メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4312500 39.1833333, 140.4375000 39.1833333, 140.4375000 39.1875000, 140.4312500 39.1875000, 140.4312500 39.1833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral